Two followers of Greece's far-right extremist Golden Dawn party have been killed and a third injured in a drive-by shooting outside the party's offices in an Athens suburb.

Greek police, cited by the BBC, report the victims, aged 22 and 27, were guarding the office.

"The two men who died on Friday were shot at close range from a motorcycle carrying two men; one got off a motorcycle wearing a helmet and shot them, Golden Dawn MP Georgios Germenis is quoted in saying.

A third man is listed in the hospital in serious condition.

Following the shooting, in the Neo Iraklio suburb of Athens, anti-terrorist police wearing riot gear cordoned off the area around the offices, amidst fears a revenge war could flare.

The attack comes weeks after several members of Golden Dawn, including the leader, were arrested on organized crime suspicions. The arrests followed the killing of a leftist Greek rapper - Pavlos Fyssas, 34, AKA Killah P. A Golden Dawn supporter was charged with the murder.

Golden Dawn leader, Nikolaos Michaloliakos, and two other senior party MPs are currently in jail, awaiting trial on charges of forming a criminal group. They deny the charges.

Last week the Greek parliament voted to suspend state funding for Golden Dawn, which is the third most popular party in Greece.

The new law allows an indefinite freeze on funding for parties whose leadership is charged with involvement in terrorism, or a criminal group.